.. _topics-reports:

=======
Reports
=======

Tryton can generate dynamic reports in many formats from report and style
templates. The reports are generated in one step as follows: a report template
in a special file format, explained later, is interpolated with dynamic data
and placed into a document of the same file format. Tryton's ability to
generate documents in this way allows documents to be generated for any editor
that supports the Open Document Format which can be converted to third party
formats, such as PDF.  Extra libraries are required for this, see INSTALL for
more information.

Report Templates
================

Report templates are files with a format supported by relatorio, that contain
snippets of the Genshi templating language.

Here is an example of the text that would be placed in an open document text
document, ``*.odt``, that displays the full name and the address lines of the
first address of each party. The genshi code is placed in the template using
``Functions->Placeholder->Text`` Fields. These are specific to ODT files.

.. highlight:: genshi

::

  <for each="party in objects">
    <party.full_name>
    <if test="party.addresses">
      <for each="line in party.addresses[0].full_address.split('\n')">
        <line>
      </for>
    </if>
  </for>


Report styles
=============

Reports styles let you standardize the header, footer and styles of your
templates.


Report API
==========

Python API
----------

.. TODO

XML Description
---------------

When defining an `ir.action.report` the following attributes are available:

    * ``name``: The name of the report.

    * ``report_name``: The name of the report model, for example
      my_module.my_report.  This is the name you would use with `Pool().get`

    * ``model``: If this report is of an existing model this is its name.
      For example my_module.my_model. Custom reports that aren't of a specific
      model will need to leave this blank.

    * ``report``: The path to the template file starting with the module, for
      example my_module/my_report.odt.

    * ``style``: The path to the style file starting with the module, for
      example, my_module/my_style.odt. If no style is to be used this field
      will be blank.

    * ``template_extension``: The template format.


Report Usage
============

Using genshi and open office reports
------------------------------------

Setting up an ODT file
^^^^^^^^^^^^^^^^^^^^^^

If you are creating a report from scratch you should perform the following
steps:

 - Remove user data

    * "File > Properties..."

    * Uncheck "Apply user data"

    * Click on "Reset"

 - Select Style and Formatting

    * Press F11 or "Format > Style and Formatting"

    * Click on the drop down at the right top

    * Select "Load Styles"

    * Click on "From File..."

    * Select a existing report (``company/header_A4.odt``)

 - Set some parameters

    * Set the zoom to 100% (View>Zoom)

    * Set the document in read-only mode

 (``Tools>Options>OpenOffice.org>Security``) (Decreases the time it takes to
 open the document.)

 - Usage

    * Use Liberation fonts (Only necessary if being officially included in
      Tryton)

    * Try to use styles in report templates so that they can be extended in
      report styles.

Using Genshi in an ODT file
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The genshi code is placed in the template using Functions->Placeholder->Text
Fields. These are specific to ``*.odt`` files and can be found in the open
office menu at Insert -> Fields -> Other and then Functions -> Placeholder ->
Text.  Type genshi code into the Placeholder field.  There are alternatives for
embedding genshi that are supported by relatorio but their use is not
encouraged within Tryton.

Also note that relatorio only supports a subset of genshi. The directives that
are supported by relatorio can be found here: `Quick Example`_ .

See genshi's documentation for more information: `Genshi XML Templates`_

Examples
^^^^^^^^

The modules company, account_invoice and stock all contain helpful examples.

Also see relatorio's site for some examples:

 - `Quick Example`_

 - `In Depth Introduction`_

 - `Example Documents`_


Accessing models from within the report
---------------------------------------

By default instances of the models the report is for are passed in to the
report via a list of objects called `objects`.  These objects behave just as
they would within trytond itself. You can access any of the models relations as
well.  For example within the invoice report each object is an invoice and you
can access the name of the party of the invoice via `invoice.party.name`.
Additional objects can be passed to a report. This is discussed below in
`Passing custom data to a report`.

Within Tryton the underlying model the report can be found by following the
Menu to ``Administration > UI > Actions > Report``. Furthermore in tryton the
fields for that model can be found by following the menu to ``Administration >
Model > Model``.  Model relation fields can be accessed to any depth, for
example, one could access `invoice.party.addresses` to get a list of addresses
for the party of an invoice.

Creating a simple report template for a model from client
---------------------------------------------------------

TODO: Explain the steps necessary to do this.

Creating a simple report template for a model in XML
----------------------------------------------------

Less work has to be done if you just want a simple report representation of a
model.  There are just 2 steps.  First, create a report template file in a
format supported by relatorio.  Second, describe your report in XML making sure
to define the correct ``report_name`` and ``model``.

Replacing existing Tryton reports
---------------------------------

To replace an existing report you must deactivate the old report and activate
the new report.

For example to deactivate the invoice report:

.. highlight:: xml

::

  <record model="ir.action.report" id="account_invoice.report_invoice">
    <field name="active" eval="False"/>
  </record>

Then you must activate the new invoice report that exists in your new module:

.. highlight:: xml

::

  <record model="ir.action.report" id="report_invoice_new">
    <field name="name">Invoice</field>
    <field name="report_name">account.invoice</field>
    <field name="model">account.invoice</field>
    <field name="report">my_module/invoice.odt</field>
    <field name="style">module_name/header_A4.odt</field>
    <field name="template_extension">odt</field>
  </record>

Passing custom data to a report
-------------------------------

TODO: Examples of overriding Report.execute.

In this example `Report.parse` is overridden and an employee object is set into
context.  Now the invoice report will be able to access the employee object.

.. highlight:: python

::

    from trytond.report import Report
    from tryton.pool import Pool

    class InvoiceReport(Report):
        __name__ = 'account.invoice'

        def parse(self, report, objects, datas, localcontext):
            employee_obj = Pool().get('company.employee')
            employee = False
            if Transaction().context.get('employee'):
                employee = employee_obj.browse(Transaction().context['employee'])
            localcontext['employee'] = employee
            return super(InvoiceReport, self).parse(report, objects, datas,
                     localcontext)
    Pool.register(InvoiceReport, type_='report')


Replacing existing Tryton styles
--------------------------------

TODO: Explanation of how to override `ir.report.get_style_content` to change
the default style.


.. _Genshi XML Templates: http://genshi.edgewall.org/wiki/Documentation/0.5.x/xml-templates.html

.. _Quick Example: http://relatorio.openhex.org/wiki/QuickExample

.. _In Depth Introduction: http://relatorio.openhex.org/wiki/IndepthIntroduction

.. _Example Documents: http://relatorio.openhex.org/browser/examples
